fixed and moved the server-side yum scripts, from nodeconfig/yum to BootstrapFS/nodeconfig/yum
now known as the nodeyum package
(might need some moer work for properly handling kexcludes in multi-fc plcs)
cleaned up all uses of /etc/planetlab/{node,slice}family
nodeconfig now does not need the build/ module anymore at build time

Setting tag nodeconfig-4.3-7
- decompose PlanetLabConf/sysctl.php into sysctl.conf and
sysctl-ip_forward.php. This is in prep of phasing out the latter
altogether, as enabling ip_forwarding should be something that is
managed by NM.
- PlanetLabConf/ntptickers.php migrated PlanetLabConf/ntp/step-tickers.php
- Added sfa_config.php
- updated ntp server set for .de (german) nodes.
- f12 related changes from Thierry/Baris

migrate kernel parameters to a static sysctl.conf file and the special proxy0 device handling into a separate sysctl-ip_forward.php script. This latter script should be NUKED and ip forwarding should be enabled by NM managing the node's interface

Tagging module nodeconfig - nodeconfig-4.3-4
add two views to the PLC config data, limited and unlimited.
unlimited view reports all values. Requires the 'infrastructure=1' tag and
that the call originates from the node.